Rishetia limborgi ( Godwin-Austen, 1920 ) Man & Ablett & Lwin & Sutcharit & Panha, 2024

Man, Nem Sian, Ablett, Jonathan D., Lwin, Ngwe, Sutcharit, Chirasak & Panha, Somsak, 2024, Contributions on a small collection of the former Subulinidae Fischer & Crosse, 1877 (Eupulmonata, Achatinoidea) with catalogue of the Glessula and Rishetia species recorded from Myanmar, ZooKeys 1208, pp. 173-239 : 173-239

33 Rishetia limborgi ( Godwin-Austen, 1920) comb. nov.

Fig. 14 G

Glessula limborgi Godwin-Austen, 1920: 56, 57. Type locality: Tenasserim [Tanintharyi Region, Myanmar].

Type specimen.

Holotype NHMUK 1903.7. 1.3200 [re-registered in error as 1985219] (Fig. 14 G ) collected by Limborg ex. Godwin-Austen collection from Tenasserim .

Diagnosis.

Shell elongate, turreted and regularly attenuated; apex rounded; subsequent whorls with fine and equally spaced radial ridges throughout. Suture impressed and whorls flattened. Aperture broadly ovate; columella strong, concave, and truncated.

Distribution.

This species is known only from the type locality and is likely endemic to that region.

Remarks.

Godwin-Austen (1920) clearly states that this taxon was described based on only a single specimen collected by O. Limborg. The original description included only a single set of shell measurements but was without illustration. The NHMUK collections contain the type specimen lot, NHMUK 1903.7. 1.3200 ex. Godwin-Austen ex. O. Limborg consisting of a single shell with an original label stating ‘ Type’. Therefore, we considered this shell as the holotype fixed by monotypy.

Figures

Figure 14. A – C Rishetia burrailensis maxwelli A, B specimen NHMUK 1903.7. 1.3742 from Somra Tracts, Somra Khulen Post, Burma and C specimen NHMUK 1903.7. 1.3744 from Somra Tracts, Somra Khulen Post, Burma D Rishetia hastula, neotype NHMUK 1906.1. 1.880 from Darjiling E, F Rishetia kentungensis, syntypes NHMUK 1903.7. 1.3650 from Mong Sing, Siam Boundary G Rishetia limborgi, holotype NHMUK 1903.7. 1.3200 from Tenasserim H, I Rishetia nathiana, syntypes NHMUK 1906.1. 1.2206 from Bassein District.